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Why Won’t My Spark Plugs Screw in All the Way

Why Won't My Spark Plugs Screw in

You’re trying to solve an issue by replacing the spark plugs but suddenly a new issue arises! The spark plug isn’t screwing in? I know it’s frustrating when you can’t even find out what the issue is.

So yes, spark plugs getting stuck while installing them is normal and nothing out of the world. Selecting the correct ones and staying a bit cautious while replacing them can save you from such inconvenience.

Troubleshooting Spark Plugs Not Screwing In

You may be wondering why won’t spark plugs screw in? Let’s check out some basic reasons and their solutions.

It is possible that you accidentally screwed the pin at the wrong angle.

You may need to get a tap if the thread chaser isn’t working. If that doesn’t cut it, you’ll have to use a repair kit.

Check if the coil-on-plug boots are completely seated. Do not take them out if the engine is hot.

Make sure you are using compatible plugs. Check the plughole, and ensure the threads are clear. First, try out the old plug to see if it’ll thread in, and then inspect the new plug.

At this point, all you need is a long extension and a spark plug socket.

Spray WD-40 and wipe around to clean around the plug. If all processes fail, you’ll have to rethread or consider “Helicoil” treatment.


  1. Use a regular tap going inwards the cylinder when re-taping, to avoid metal shavings entering the cylinder head.
  2. Cross-threading the soft aluminum head is not a good idea.

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